These nondescript stone hammers are marked with a certain dwarven rune: two circles, one inside the other. They are found throughout dwarven delves, lying on ledges and wedged in rock fissures, as though discarded. Attacks made with this weapon counts as a magic weapon until its one charge is released.
They are actually emergency aids. If an air hammer is broken, or the rune upon it struck sharply (i.e. if it is used to strike a blow), it activates. A loud, repetitive knocking noise is heard, and the air hammer (or its shards) begins to vibrate rapidly, swinging back and forth, as it diminishes in size. The stone hammer is actually the stopper or portal valve to an extra-dimensional space, filled with pressurized oxygen from the Elemental Plane of Air. When it is activated, the extradimensional space rapidly collapses, pumping its contents into the surrounding atmosphere. Dwarves use this to escape underground smoke, poisonous gases (including magical cloudkill effects), or floods (an air hammer will create a bubble of air). The oxygen will forcibly drive out existing atmosphere, providing clean air in a 30foot radius globe around the activation point. There is enough air to last eight man-sized creatures (or twelve dwarves) for an hour, given normal exertion (the air will last half that time if combat occurs). This clean air cannot be moved as an intact globe, once released, and is highly dangerous if brought into contact with open flames, typically creating an instant 3O'-radius, ball of fire. Magical fireballs that contact an air hammer's oxygen globe will instantly double in radius, and damage.
Proficiency with a Light Hammer allows you to add your proficiency bonus to the attack roll for any attack you make with it.
This weapon has the following mastery property. To use this property, you must have a feature that lets you use it.
Nick. When you make the extra attack of the Light property, you can make it as part of the Attack action instead of as a Bonus Action. You can make this extra attack only once per turn.
Notes: Bonus: Magic, Damage, Combat, Light, Thrown, Nick
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